Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality a+3a >2-3a >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
         a + 3 * a >2 - 3 * a         (1)
        2 - 3 * a >0         (2)

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    From inequality(1)：
         a ＞ 2/7
    From inequality(2)：
         a < 2/3

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    From inequalities (1) and (2)
         2/7 < a < 2/3     (3)

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    The final solution set is :
         2/7 < a < 2/3

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